Superconducting Qubits: Latest IBM, Google & Rigetti Developments
Latest superconducting qubit news: IBM Quantum, Google Willow chip, Rigetti Novera. Cryogenic systems, error correction & quantum supremacy updates.
Superconducting qubits represent the most commercially advanced quantum computing technology, powering systems from IBM, Google, and Rigetti. These quantum processors leverage Josephson junctions—superconducting circuits that create non-linear inductance—to generate controllable quantum states at temperatures near absolute zero (15-20 millikelvin).
The dominant superconducting qubit design, the transmon qubit, balances coherence time and control simplicity by reducing sensitivity to charge noise. Recent breakthroughs include Google's Willow chip achieving below-threshold quantum error correction, demonstrating that increasing qubit count can actually reduce errors—a critical milestone for fault-tolerant quantum computing. IBM continues scaling its Heron processor architecture toward 1,000+ qubit systems while improving gate fidelities above 99.5%.
India's National Quantum Mission & Superconducting Qubits
India's National Quantum Mission (NQM), approved by the Union Cabinet on 19 April 2023 with an allocation of ₹6,003.65 crore for eight years (2023-2031), prioritizes superconducting qubit development under its Quantum Computing Thematic Hub. The Foundation for QC Innovation at IISc Bengaluru serves as the lead institution for this hub, working with IIT Delhi, IIT Bombay, TIFR Mumbai, and other institutions. The Tata Institute of Fundamental Research (TIFR) in Mumbai has established dilution refrigeration laboratories capable of operating at ultra-low temperatures to support superconducting qubit research. In August 2024, DRDO scientists from the Young Scientists Laboratory for Quantum Technologies (DYSL-QT), in collaboration with TIFR and TCS, completed end-to-end testing of a 6-qubit superconducting quantum processor with a novel ring-resonator design. This system includes a cloud-based interface developed by TCS for submitting quantum circuits and receiving computed results.
The NQM targets developing intermediate-scale quantum computers with 50-1000 physical qubits in eight years using various platforms including superconducting and photonic technology. Indigenous development of quantum fabrication facilities is underway, with IISc Bengaluru and IIT Bombay establishing quantum computing fabrication facilities under a ₹720 crore investment announced in November 2025. These facilities will support superconducting, photonic, and spin qubit technologies.
Key Advantages
Key advantages of superconducting qubits include nanosecond gate speeds enabling rapid algorithm execution, established semiconductor fabrication processes supporting manufacturing scalability, and a strong cryogenic infrastructure ecosystem. Current challenges include decoherence times (100-300 microseconds) that remain shorter than trapped-ion alternatives, error rates requiring extensive quantum error correction overhead, and cryogenic operation demands for specialized infrastructure.
Major Players
Major global players include IBM Quantum with cloud-accessible systems (Eagle, Osprey, Condor processors), Google Quantum AI focusing on error correction and quantum supremacy demonstrations, and Rigetti Computing offering hybrid quantum-classical systems. In India, the Foundation for QC Innovation at IISc, TIFR Mumbai, and IIT Bombay are building national capability with NQM support, while startups including QpiAI India are working on superconducting quantum computers.
quantum-computingUncle Sam's $2B Quantum Gift: Buy D-Wave, Skip Rigetti
Uttam Dey6.5K FollowersFollow5ShareSavePlay(9min)CommentsSummaryD-Wave Quantum (QBTS) is rated Buy, benefiting from the US DoC's $2B quantum industry investment, while Rigetti Computing (RGTI) remains Hold.The $2B federal funding, distributed as cash-for-equity across 9 companies, signals a strategic shift and accelerates US quantum industry development.QBTS stands out with a ~2000% backlog growth, unique quantum annealing approach, and a more attractive ~9x forward book value multiple versus RGTI's 14-15x.Risks include potential shareholder dilution, non-binding funding agreements, and a 6–18 month timeline before capital deployment. koto_feja/E+ via Getty Images Investment Thesis The US government announced a landmark $2B sovereign funding scheme that will see the US Commerce Dept. invest $2B worth of grants and equity throughout America’s quantum computing industry. The news, confirmed by theThis article was written byUttam Dey6.5K FollowersFollowUttam is a growth-oriented investment analyst whose equity research primarily focuses on the technology sector. Semiconductors, Artificial Intelligence and Cloud software are some of the key sectors that are regularly researched and published by him. His research also focuses on other areas such as MedTech, Defense Tech, and Renewable Energy. In addition, Uttam also authors The Pragmatic Optimist Newsletter along with his wife, Amrita Roy, who is also an author on the newsletter as well as on this platform. Their newsletter gets regularly cited by leading publications such as the Wall Street Journal, Forbes, etc. Prior to publishing his research, Uttam worked in Silicon Valley, leading teams for some of the largest technology firms in the world, including Apple and Google.Analyst’s Disclosure: I/we have no stock, option or similar derivative position in any of the companies mentioned, and no plans to initiate any such positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am
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quantum-computingIs D-Wave Quantum Stock a Buy After a 50% Gain This Week?
Investors are jumping aboard D-Wave Quantum (QBTS +12.98%) stock this week. D-Wave shares drifted lower after it reported first-quarter earnings on May 12, even though the company announced record quarterly bookings and outlined a roadmap to scale its quantum technology. Now investors are pouring back into the stock, though, with D-Wave shares soaring about 54% this week as of Friday afternoon, according to data provided by S&P Global Market Intelligence. Image source: The Motley Fool. What the federal grant means This week's surge followed the National Institute of Standards and Technology (NIST), an agency under the U.S. Department of Commerce, announcing it would award $2 billion in grants to nine companies operating in the quantum computing space. D-Wave was one of those nine. The NIST will also take a minority stake in each company. IBM was awarded half of that grant money, but D-Wave will receive $100 million, along with several other mid-cap quantum names. The funding alone, stemming from the U.S. CHIPS and Science Act, isn't what really caused D-Wave stock to rocket higher this week, though. ExpandNYSE: QBTSD-Wave QuantumToday's Change(12.98%) $3.34Current Price$29.08Key Data PointsMarket Cap$9.5BDay's Range$26.11 - $31.5552wk Range$12.75 - $46.75Volume4.5MAvg Vol28.3MGross Margin32.92% D-Wave already has sufficient cash on hand. As of March 31, the company had nearly doubled its cash and marketable securities versus the prior-year period to $588 million. The company is also generating revenue with its leading annealing quantum systems. In January, D-Wave acquired Quantum Circuits (QCI) to help it scale up gate-model quantum computers. The combination will provide customers with a complete quantum computing ecosystem, and the new U.S. government connection will go a long way toward marketing that capability. The $100 million is a great way to help expand R&D to complete its commercial offerings. The relationship with the government could be what real
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quantum-computingD-Wave Quantum Is Skyrocketing Today -- Is the Stock a Buy Right Now?
D-Wave Quantum (QBTS +12.98%) stock is roaring higher in Friday's trading. The quantum computing specialist's share price was up 17.2% as of 1:30 p.m. ET. Meanwhile, the S&P 500 was up 0.8%, and the Nasdaq Composite was up 0.6%. Following yesterday's news that D-Wave Quantum had signed a letter of intent to secure $100 million in funding through the CHIPS and Science Act, TD Cowen has named the company one of the top three biggest winners from the U.S. government's new quantum computing investment initiative. The other two companies named by TD Cowen as top beneficiaries of the project were Rigetti Computing and GlobalFoundries. Image source: Getty Images. Is D-Wave stock a buy right now? In exchange for receiving $100 million in funding from the U.S. Department of Commerce over a three-year period, D-Wave will be providing the department with new stock of the equivalent value. D-Wave will be creating new shares to sell to the government, which means that current shareholders will see stock dilution as a result of the deal. On the other hand, the Department of Commerce's pending investment in D-Wave represents a powerful vote of confidence from one of the best partners the company could have. ExpandNYSE: QBTSD-Wave QuantumToday's Change(12.98%) $3.34Current Price$29.08Key Data PointsMarket Cap$9.5BDay's Range$26.11 - $31.5552wk Range$12.75 - $46.75Volume4.5MAvg Vol28.3MGross Margin32.92% The government's plan to invest in D-Wave doesn't necessarily mean that the company will emerge as a long-term winner in the quantum space, but it signals that the tech specialist is viewed as one of the most promising players in the industry. With the company valued at roughly $11.15 billion as of this writing, D-Wave is trading at approximately 263 times this year's expected sales. The quantum specialist's valuation profile and speculative outlook mean that it continues to be a very risky investment candidate, but substantial government investment could lend legitimacy to its
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quantum-computingWhy Rigetti Computing Stock Is Skyrocketing Today
Rigetti Computing (RGTI +18.67%) stock is seeing another round of huge gains in Friday's trading. The quantum computing company's share price was up 22.8% as of 1 p.m. ET. The S&P 500 and the Nasdaq Composite were each up 0.4% at the same point in the daily session. Rigetti stock had been up as much as 26.4% earlier in the day. Along with bullish momentum for the broader market today, Rigetti Computing's valuation is getting another boost from yesterday's news that some leading quantum-computing dare set to receive funding through the U.S. CHIPS and Science Act. As of this writing, Rigetti Computing is now up roughly 19% in 2026. Image source: Getty Images. CHIPS Act funding has been a bullish catalyst for Rigetti In a press release published yesterday, Rigetti announced that it had signed a letter of intent with the U.S. Department of Commerce to secure an investment of up to $100 million. The funding will be used to accelerate the company's development of quantum technologies and is on track to be dispersed over three years. In exchange for the funding, Rigetti will sell new shares of its stock to the Department of Commerce. ExpandNASDAQ: RGTIRigetti ComputingToday's Change(18.67%) $4.12Current Price$26.16Key Data PointsMarket Cap$7.3BDay's Range$22.67 - $27.7952wk Range$10.30 - $58.15Volume5.8MAvg Vol30.6MGross Margin-5945.49% What's next for Rigetti? In a note published this morning, TD Cowen stated that it viewed Rigetti as one of the three biggest beneficiaries of the U.S. Department of Commerce's investments in quantum computing. The other two companies on its list were D-Wave Quantum and GlobalFoundries. TD Cowen's analysts said that the Department of Commerce's investment moves "underscore the strategic value" of the quantum computing industry. With Rigetti and other quantum-computing players receiving another significant vote of confidence from the U.S. government, the industry's growth opportunities could continue becoming increasingly legitimate and
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quantum-computingWhy Rigetti Computing Stock Keeps Going Up
Yesterday, as you've probably heard, The Wall Street Journal reported on a Trump Administration plan to award $2 billion to nine quantum computing companies -- Rigetti Computing (RGTI +20.87%) among them -- and to take government equity stakes in the companies in return. Rigetti shares started moving one day before the announcement was made, then rocketed higher yesterday -- and higher again today. Up 18% through 10:55 a.m. Friday morning, Rigetti shares have gained an astounding 63% in just three days of trading, and investors are wondering: Is any price too high to pay for this quantum computing stock? Image source: Getty Images. And now it's official Shortly after WSJ broke the story, the U.S. Department of Commerce confirmed that not only does it plan to award grants, but it has in fact already signed letters of intent to do so. Operating under the CHIPS and Science Act, Commerce will "support and accelerate critical research and manufacturing of technologies for the quantum ecosystem to ensure continued United States leadership and national security." Two quantum foundries, Globalfoundries (GFS +7.54%) and International Business Machines (IBM +1.56%), will receive $375 million and $1 billion, respectively. Rigetti and five others will receive $100 million apiece, and the ninth company will receive $38 million. Each of the seven non-foundry recipients will focus on specific technologies needed to build quantum computers. Rigetti in particular will focus on miniaturization and cryostat devices for maintaining extremely low temperatures. ExpandNASDAQ: RGTIRigetti ComputingToday's Change(20.87%) $4.60Current Price$26.64Key Data PointsMarket Cap$7.3BDay's Range$22.67 - $26.7252wk Range$10.30 - $58.15Volume3.6MAvg Vol30.6MGross Margin-5945.49% What does this mean for Rigetti stock? The question now is how much good even this money can do for Rigetti, which is burning more than $80 million a year. Even if Rigetti gets all of the "up to $100 million" it's allotted, thi
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quantum-computingRigetti Surges 17%, Quantum Computing Inc. Soars 14%, D-Wave Pops 13%, IonQ Rises 8%: The Quantum Bounce Becomes a Rally - Yahoo Finance
Rigetti Surges 17%, Quantum Computing Inc. Soars 14%, D-Wave Pops 13%, IonQ Rises 8%: The Quantum Bounce Becomes a Rally Yahoo Finance
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quantum-computingFlatiron Institute Tensor Network Algorithm Overturns Historical D-Wave Quantum Supremacy Claim
Flatiron Institute Tensor Network Algorithm Overturns Historical D-Wave Quantum Supremacy Claim Physicists at the Center for Computational Quantum Physics (CCQ) at the Simons Foundation’s Flatiron Institute, in collaboration with Boston University, have developed a classical algorithm that successfully simulates complex three-dimensional quantum dynamics previously claimed to be impossible without a quantum computer. Published in Science, the study refutes a high-profile “beyond-classical” computation milestone reported in March 2025 by researchers utilizing D-Wave Systems’ 5,000-qubit Advantage2 superconducting quantum annealing processor. By repurposing and optimizing decades-old data compression and mathematical routing techniques, the CCQ team proved that classical workstations—and in some configurations, standard commercial laptops—can achieve state-of-the-art accuracy when calculating highly entangled quantum state progressions. Technical Architecture & Specifications / Operational Implementation The computational breakthrough targets the simulation of continuous-time quantum dynamics within the transverse-field Ising model (TFIM) across multi-dimensional square, cubic, and diamond disordered spin-glass lattices. The 2025 D-Wave demonstration relied on the premise that as hundreds of interacting qubits undergo a rapid quench through a quantum phase transition, the system’s wave function generates area-law entanglement that causes classical matrix-product-state approaches to scale exponentially in memory and runtime. To bypass this exponential memory wall without directly storing the massive wave function, the CCQ team constructed a lattice-specific, three-dimensional tensor network architecture utilizing ITensor, an in-house high-performance software library. The mathematical implementation processes the state evolution via a two-stage pipeline: Time Evolution Tracking: The algorithm adapts belief propagation (BP)—a localized message-passing routine origin
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quantum-computingAlice & Bob Secures NVentures Backing and Backs Expanded €1 Billion French Plan Quantique
Alice & Bob Secures NVentures Backing and Backs Expanded €1 Billion French Plan Quantique Alice & Bob has secured a strategic venture capital investment from NVentures, the private equity arm of NVIDIA Corporation, expanding its existing €100 million ($116 million USD) Series B funding round. The investment follows a public policy milestone where French President Emmanuel Macron announced an additional €1 billion ($1.16 billion USD) allocation to the state’s sovereign quantum strategy, Plan Quantique, alongside €550 million ($638.165 million USD) for microelectronics manufacturing. The financial injection accelerates Alice & Bob’s dual-track deployment strategy: expanding its hardware-stabilized superconducting architecture and standardizing its hybrid code integration pipelines alongside high-performance computing (HPC) centers globally. Technical Architecture & Specifications / Operational Implementation The technical roadmap focuses on co-engineering hybrid quantum-GPU supercomputing environments by connecting Alice & Bob’s proprietary cat-qubit hardware directly to NVIDIA’s accelerated computing footprint. Cat qubits utilize non-linear multi-photon driving and dissipation within superconducting cavities to suppress physical bit-flip errors at the hardware level, leaving only phase-flip errors to be managed by software-level orchestration layer protocols. This hardware-level error mitigation scheme reduces total physical-to-logical qubit scaling overhead requirements by up to 200 times compared to unmitigated transmon architectures. The operational software loop is handled via NVIDIA’s CUDA-Q, cuQuantum, and NVQLink open architectures, allowing low-latency data handovers between GPUs and quantum registers. The technical framework is simulated using Dynamiqs, Alice & Bob’s open-source, hardware-aware time-dependent quantum simulation library. Strategic Positioning & Ecosystem Integration The combined venture backing and national capital
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quantum-computingPasqal Benchmarks Error-Detected Logical Qubits Against Physical Counterparts Using Quantum Kernels
Pasqal Benchmarks Error-Detected Logical Qubits Against Physical Counterparts Using Quantum Kernels Pasqal Holding SAS has published application-level hardware research comparing the performance of logical and physical qubits executing a machine learning algorithm. Conducted in collaboration with the Université Paris-Saclay and the Institut d’Optique, the benchmark evaluated a quantum kernel-based differential equation solver. The experiment represents a transition for neutral-atom hardware from executing isolated code subroutines to processing end-to-end applications on an error-detecting architecture. The publication follows the company’s disclosure of a definitive business combination agreement to list on the public markets via a merger with Bleichroeder Acquisition Corp. II (Nasdaq: BBCQ). Technical Architecture & Specifications / Operational Implementation The computation was executed on Pasqal’s neutral-atom quantum processor, operating at a baseline physical gate fidelity of 99.4%. To insulate the machine learning workflow from noise-induced phase accumulation, the engineering team implemented a continuous [[4,2,2]] quantum error-detecting code, which groups and binds four physical hardware registers into two stable logical qubit registers. The research team systematically mapped 1,000 distinct differential equations into a quantum kernel estimator configured at both the physical and logical layers. Despite the higher quantum circuit depth and physical gate overhead mandated by the logical encoding, the error-detected kernel restricted noise propagation during state preparation. This resulted in an average error reduction of more than 50% across the dataset, with a median residual error metric of 0.042 for the logical execution compared to 0.069 for the unencoded physical circuits. Strategic Positioning & Ecosystem Integration The application-driven benchmarking project was financed through the PROQCIMA program under the France 2030 national investmen
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quantum-computingAlice & Bob Announces Investment From NVIDIA’s VC Arm in Series B Extension
Insider Brief Alice & Bob said NVentures, NVIDIA’s venture capital arm, expanded the company’s €100 million Series B round to support development of its fault-tolerant quantum computing architecture based on cat qubits. The companies said they have collaborated since 2024 on integrating Alice & Bob’s technology with NVIDIA’s hybrid quantum-classical computing ecosystem, including CUDA-Q, cuQuantum, Dynamiqs, and NVQLink. Alice & Bob and NVIDIA said they plan to continue working on bringing hybrid quantum-GPU systems to high-performance computing centers by integrating cat-qubit hardware with NVIDIA’s accelerated computing infrastructure and software stack. Image: Alice & Bob founders: Théau Peronnin and Raphael Lescanne (Alice & Bob) PRESS RELEASE — Alice & Bob, a leader in fault tolerant quantum computing, announces investment from NVentures, NVIDIA’s venture capital arm, that expands its €100 million Series B round. The investment supports Alice & Bob’s development of an architecture towards fault-tolerant quantum computing. Financial details of the investment were not disclosed. “We’ve been working alongside NVIDIA to connect our cat-qubit architecture with its full accelerated computing ecosystem, from hardware to software, in support of the first fault-tolerant quantum computers. NVentures’ investment marks a new phase in that relationship and reinforces our common view that the future of quantum will be hybrid, combining quantum and classical computing to solve real-world problems.” Théau Peronnin, CEO, Alice & Bob “NVIDIA has built the platform the quantum ecosystem needs to develop and run hybrid quantum-GPU supercomputers, connecting quantum processors to state-of-the-art accelerated computing. Alice & Bob shares NVIDIA’s vision for accelerated quantum supercomputing, and has worked closely with us to integrate their qubits with our quantum platform for advancing the scientific computing of the future,” Timothy Costa, Vic
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quantum-computingRobots Learn Navigation Using Quantum Processing and Achieve Stable Trajectories
Mohamed Khair Altrabulsi and colleagues at NYUAD Research Institute, in collaboration with New York University, present Q-SpiRL, a quantum spiking reinforcement learning framework for obstacle-aware robot navigation in dynamic environments. Their research compares five agent families, focusing on a quantum-enhanced spiking neural network (QSNN) integrating spike-based temporal processing with quantum feature transformation. Experiments in grid-world environments, ranging from 20×20 to 40×40, show QSNN achieves a success rate of up to 99% while maintaining efficient and smooth trajectories, and key validation confirms the feasibility of deploying this hybrid policy on actual IBM quantum hardware. Quantum spiking neural networks achieve near-perfect robotic navigation in complex environments A 99% success rate in complex grid-world environments was attained by a new quantum-enhanced spiking neural network, exceeding previous capabilities in robot navigation. High reliability and efficient path planning in active environments previously proved difficult for robotic systems, with conventional methods struggling to scale effectively with increasing complexity. The Q-SpiRL framework, utilising a quantum spiking neural network (QSNN), combines the benefits of spike-based temporal processing, mimicking the brain’s efficient signalling, with variational quantum feature transformation to refine data interpretation. Traditional reinforcement learning algorithms often require extensive training and struggle with the ‘curse of dimensionality’ as the environment’s complexity increases, leading to slow learning times and suboptimal policies. Q-SpiRL addresses these limitations by leveraging the principles of both spiking neural networks and quantum computation. The Q-SpiRL framework outperformed tabular Q-learning, classical multilayer perceptrons, classical spiking neural networks, and quantum-enhanced multilayer perceptrons in terms of task completion, trajectory efficiency, and
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quantum-computing$1 Billion CHIPS Award Backs IBM’s Quantum Foundry Build
A combined investment of 1 billion from the U.S. Department of Commerce and IBM will establish Anderon, America’s first pure-play quantum foundry, to accelerate domestic innovation in a rapidly evolving field. The new company, headquartered in Albany, New York, will focus exclusively on the advanced manufacturing of 300-millimeter quantum wafers, a critical step toward securing U.S. leadership in quantum technology and potentially capturing a share of the estimated 850 billion quantum market. Secretary of Commerce Howard Lutnick said that the CHIPS Research and Development investments in quantum computing will support this effort. IBM’s Arvind Krishna added that the initiative will fuel America’s fast-growing quantum technology industry by leveraging the company’s decades of experience in quantum computing and wafer fabrication. 1 Billion CHIPS Award Fuels Anderon Quantum Foundry Creation The establishment of Anderon, a new quantum chip foundry, signifies a substantial commitment to domestic quantum technology manufacturing, backed by a combined investment of 2 billion. This initiative, funded by a proposed 1 billion in CHIPS incentives from the U.S. Department of Commerce and 1 billion from IBM, will establish America’s first pure-play quantum foundry, concentrating exclusively on the complex process of quantum wafer production for a diverse range of companies. Central to Anderon’s manufacturing approach is the utilization of 300-millimeter quantum wafers, a larger format intended to increase production efficiency and potentially lower costs compared to smaller wafer sizes currently in use. Bill Frauenhofer, Executive Director of Semiconductor Investment and Innovation, highlighted the broad implications of quantum computing, noting its significance for national defense, advanced materials and biopharmaceutical discovery, financial modeling, and energy systems. Anderon’s initial focus will be on superconducting qubit wafers and supporting electronics, with plans to
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quantum-computingQuantum Entanglement’s Paradox Explained by Standard Theory Alone
Gregory D. Scholes, at Princeton University, and colleagues have revealed how a single wavefunction encapsulates a range of potential measurement results. The approach explains both state vector collapse and the seemingly paradoxical nonlocal correlations observed between separated quantum subsystems. Quantum correlations, even those violating Bell’s inequality, arise naturally from classical measurements, offering a thorough explanation within the existing framework of quantum theory without requiring additional assumptions or nonlinearities. Mapping entangled states via Cartesian product decomposition reveals subsystem properties Dr. Eleanor Rieffel and colleagues at Quantum AI employed a technique focused on dissecting the overall description of an entangled state, a complete description of a quantum system, into the individual components representing its separated subsystems. Mathematically mapping the combined system’s state vector onto a Cartesian product of vector spaces effectively created separate ‘blueprints’ for each subsystem. This decomposition isn’t merely a mathematical convenience; it reflects the physical separability of the subsystems even while acknowledging their quantum connection. The Cartesian product allows for the representation of the combined system’s state as a tensor product of individual subsystem states, facilitating analysis of each component’s contribution to the overall entanglement. This process accounted for contextual phase factors, subtle elements within the initial state that encode how measurements on one subsystem influence the others, and these factors are inherent to the system’s description but not immediately obvious. These phase factors are crucial because they determine the interference patterns that give rise to quantum correlations and are directly linked to the system’s evolution over time. Ignoring them would lead to an incomplete and inaccurate representation of the entangled state. The technique avoids assumptions
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quantum-computingFidelity-Aware Frequency Allocation and Transpilation Co-Design for Tunable Coupler Quantum Systems
--> Quantum Physics arXiv:2605.21662 (quant-ph) [Submitted on 20 May 2026] Title:Fidelity-Aware Frequency Allocation and Transpilation Co-Design for Tunable Coupler Quantum Systems Authors:Dylan VanAllen, Evan McKinney, Israa G. Yusuf, Girgis Falstin, Gaurav Agarwal, Jason Pollack, Michael Hatridge, Alex K. Jones View a PDF of the paper titled Fidelity-Aware Frequency Allocation and Transpilation Co-Design for Tunable Coupler Quantum Systems, by Dylan VanAllen and 7 other authors View PDF HTML (experimental) Abstract:Frequency crowding is a fundamental limitation in superconducting quantum architectures, particularly in tunable-coupler systems. We present a framework that explicitly models both coherent spectator-induced errors and incoherent lifetime effects through an error budgeting approach. Using this model, we analyze how frequency crowding impacts gate fidelity as module size and connectivity scale, and formulate a constrained optimization problem to assign qubit and coupler frequencies under realistic separation and hardware constraints. We demonstrate scalable frequency allocation strategies that minimize spectator-induced errors. We further show that increasing qubit count and coupling density within a module leads to a fidelity-connectivity tradeoff. To explore the benefits at the system scale, we have developed a noise-aware transpilation approach called FINESSE, which minimizes error by selecting high-fidelity paths that satisfy connectivity via SWAP insertion while jointly optimizing downstream gate execution. We demonstrate this physics-informed architecture-transpilation co-design approach for a SNAIL-based third-order coupler that natively realizes the $\sqrt{iSWAP}$ basis with frequency aware gate fidelities. On SNAIL architectures, FINESSE achieves an average 8.9% reduction in log-infidelity cost and 6.8% reduction in circuit depth vs. SABRE. We also compare results on IBM Brisbane's architecture. Comments: Subjects: Quantum Physics (quant-ph) Cit
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quantum-computingGlobalFoundries Launches Specialized Business Unit to Expand Onshore Quantum Hardware Manufacturing
GlobalFoundries Launches Specialized Business Unit to Expand Onshore Quantum Hardware Manufacturing GlobalFoundries (GF) has established a new business division, Quantum Technology Solutions, to scale commercial fabrication capabilities for the quantum computing industry. The unit enters the market with active customer engagements and a pipeline of quantum hardware developers preparing to scale production. In conjunction with this launch, the U.S. Department of Commerce signed a letter of intent to provide $375 million in federal funding under the CHIPS and Science Act to accelerate the build-out of these domestic manufacturing lines. Additionally, under a separate agreement to distribute these funds, the U.S. Department of Commerce will acquire a strategic minority equity investment in GF representing approximately one percent ownership of the corporation. Technical Architecture & Specifications / Operational Implementation The manufacturing framework leverages GF’s existing FDX platform to deliver proprietary cryogenic complementary metal-oxide-semiconductor (CMOS) technology. These cryogenic CMOS circuits provide the specialized sensing, low-temperature readout, and control integrated circuits (ICs) required to operate quantum systems without thermal degradation. Building upon this baseline, Quantum Technology Solutions is engineering standardized fabrication lines to construct Quantum Processor Units (QPUs) across multiple hardware modalities, including superconducting, trapped-ion, silicon photonic, topological, and silicon spin-qubit architectures. The industrial infrastructure also incorporates advanced three-dimensional (3D) heterogeneous packaging and superconducting interconnect platforms to physically bind the micro-architectures into unified, data-center-ready computing blocks. Strategic Positioning & Ecosystem Integration The division establishes an industrial fabrication layer within a trusted domestic semiconductor ecosystem, addressing nation
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quantum-computingWhy Rigetti Computing Stock Is Rocketing Higher Today - The Motley Fool
Why Rigetti Computing Stock Is Rocketing Higher Today The Motley Fool
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quantum-computingWhy Rigetti Computing Stock Is Rocketing Higher Today
Rigetti Computing (RGTI +26.81%), as well as several other quantum computing stocks, are bumping higher today thanks to reports that the U.S. government plans $2 billion in awards to quantum computing companies. As of 12:31 p.m. ET, shares of Rigetti are up 25%. Image source: Getty Images. This quantum computing specialist is set to speed up research on superconducting. Rigetti announced today that it has signed a letter of intent (LOI) with the U.S. Department of Commerce with respect to an award totaling up to $100 million in funding over the next three years to expedite research and development on superconducting quantum computing. ExpandNASDAQ: RGTIRigetti ComputingToday's Change(26.81%) $4.53Current Price$21.41Key Data PointsMarket Cap$5.6BDay's Range$18.40 - $21.6852wk Range$10.30 - $58.15Volume5.3MAvg Vol29MGross Margin-5945.49% Speaking to the merits of the potential partnership with the U.S. government, Subodh Kulkarni, Rigetti's CEO, stated: "We are honored that the U.S. government is seeking to partner with Rigetti to accelerate the pace of quantum computing commercialization and to bolster U.S. leadership in this revolutionary field. This investment will allow us to tackle key scaling bottlenecks more rapidly and get us closer to utility-scale quantum computing." In addition to Rigetti receiving $100 million in funding, the company acknowledges that the U.S. government may take an equity stake, bringing the total capital it awards Rigetti to $100 million. Is Rigetti stock a buy on today's news? Ending the first quarter of 2026 with $569 million in cash, cash equivalents, and investments with no outstanding debt, Rigetti is on sound financial footing, and it may be even stronger thanks to today's announcement. For those interested in a pure-play quantum computing stock, Rigetti is a solid consideration -- though investors must be more tolerant of risk since it doesn't generate operating cash flow.Read NextMay 19, 2026 •By Anthony Di PizioPrediction: Riget
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quantum-computingDid Amazon Just Deliver a Sweeping Blow to IonQ?
Amazon's (AMZN +1.29%) quiet engagement with IonQ (IONQ +10.21%) reflects the careful ways large companies may choose to explore new business opportunities. Rather than making a long-term commitment, the tech giant made a small investment in the quantum computing specialist, representing a tactical move within a broader strategy related to its cloud-based quantum computing services. Image source: The Motley Fool. Taking a look at Amazon's investment in IonQ According to 13F filings, Amazon took an initial stake in IonQ during the second quarter of 2025, acquiring 854,207 shares. Technology giants like Amazon don't typically buy shares in specialized companies without clear business alignment. I think the investment in IonQ allowed the company to signal potential interest for a collaboration with Amazon Web Services (AWS) while also gaining indirect exposure to advancements in trapped-ion quantum systems. Investing in IonQ could have been a way to strengthen ties in AWS' emerging quantum ecosystem without requiring Amazon to raise its already aggressive capital expenditure roadmap. At the end of the day, the scale of its IonQ investment remained modest relative to Amazon's liquidity resources, suggesting it served more as a bridge and a hedge for its internal developments rather than a core pillar of the company's quantum AI roadmap. ExpandNYSE: IONQIonQToday's Change(10.21%) $5.36Current Price$57.83Key Data PointsMarket Cap$20BDay's Range$53.97 - $61.1252wk Range$25.89 - $84.64Volume2.6MAvg Vol29MGross Margin-2879.52% Why Amazon may have been interested in IonQ Several factors probably motivated Amazon's investment in IonQ. First, the integration of IonQ's quantum hardware with AWS Braket, Amazon's managed service for quantum computing experiments, was likely core to the thesis. Developers can access IonQ's systems directly through AWS, creating a seamless experience for running hybrid quantum-classical workloads. In theory, this enhances Braket's appeal and could d
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quantum-computingWhy Did Quantum Computing Stock Pop Today?
Valued at only $2.2 billion in market capitalization, Quantum Computing (QUBT +15.74%) stock may have the best name in the quantum computing industry -- but it's still one of the smaller stocks in this industry. Despite what you may be seeing happen with the stock price today, however, I fear Quantum Computing may be destined to stay small. Shares of Quantum Computing leapt 16% through 11:05 a.m. ET Thursday morning, after The Wall Street Journal reported the Trump Administration plans to award $2 billion in grants to nine quantum computing companies and take equity stakes to secure its investment in each. Image source: Getty Images. Money for thee, but not for me That sounds like good news, but here's the thing: Quantum Computing is not one of these nine companies. Instead of giving money to Quantum Computing, the Trump Administration will award $100 million each to its rivals D-Wave Quantum (QBTS +24.66%), Infleqtion (INFQ +30.50%), and Rigetti Computing (RGTI +24.88%), $375 million to Globalfoundries (GFS +10.62%), and a cool $1 billion to International Business Machines (IBM +8.48%)! A handful of privately owned companies will split the remainder of the $2 billion. And Quantum Computing itself will get none. ExpandNASDAQ: QUBTQuantum ComputingToday's Change(15.74%) $1.50Current Price$11.06Key Data PointsMarket Cap$2.2BDay's Range$10.32 - $11.2952wk Range$6.18 - $25.84Volume1.6MAvg Vol16MGross Margin-15399.17% What does this mean for Quantum Computing stock? So how is this good news for Quantum Computing stock, if it's getting no money, and everyone else is getting a lot of money -- plus backing from the U.S. government that will give it an interest in seeing Quantum Computing's rivals succeed (and perhaps that Quantum Computing fails)? I honestly don't see any logic in investors buying Quantum Computing stock on this news. With analysts still expecting the stock to lose money for years, it may be time to sell.Read NextMay 17, 2026 •By Keith NoonanWhy Quantum Com
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quantum-computingWhy Did IonQ Stock Pop Today?
Valued at $19.6 billion, IonQ (IONQ +12.26%) stock is the biggest pure play on quantum computing you can buy. That's the good news for IonQ today. The bad news is that... the United States government is not buying IonQ stock -- but it's buying shares in just about everybody but IonQ. This is the news that's moving IonQ stock up 9.5% through 10:35 a.m. ET Thursday morning: According to an exclusive report in today's The Wall Street Journal, the Trump Administration will award $2 billion in grants to nine quantum computing companies and take equity stakes to secure its investment in each. Image source: Getty Images. Money for thee, but not for me IonQ is not one of these companies, but its smaller publicly traded rivals D-Wave Quantum (QBTS +25.44%), Infleqtion (INFQ +33.63%), and Rigetti Computing (RGTI +24.88%) are all receiving grants and investments. So too is that old dinosaur of computing, International Business Machines (IBM +8.48%) -- which indeed is getting half the funds on offer, a nice, round $1 billion. D-Wave, Infleqtion, and Rigetti will each receive $100 million. Globalfoundries (GFS +10.62%) will get $375 million, and the rest will be parceled out among a handful of privately owned companies -- including one part-owned by Donald Trump Jr's 1789 Capital! But again, no money for IonQ. ExpandNYSE: IONQIonQToday's Change(12.26%) $6.43Current Price$58.90Key Data PointsMarket Cap$20BDay's Range$53.97 - $61.1252wk Range$25.89 - $84.64Volume2.1MAvg Vol29MGross Margin-2879.52% What does this mean for IonQ stock? So how is any of this good news for IonQ, if it's getting no money, and everyone else is getting a lot of money -- plus backing from the U.S. government that will give it an interest in seeing IonQ's rivals succeed (and perhaps that IonQ fails)? I honestly don't get the logic behind investors buying IonQ on this news. With analysts still expecting the stock to lose money for years, it may be time to sell.Read NextMay 20, 2026 •By Parkev Tatevosian, CFA
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